Africa Correspondent for Foreign Policy Magazine, Nosmot Gbadamosi on the violence that has broken out in Tanzania after this week's election. Mihai Sora, from the Lowy Institute on a proposal for greater intelligence sharing between Australia and its Pacific neighbours. Kari Byron, former co-host of the science smash-hit Mythbusters on the importance of cultivating a new generation of STEM prodigies. Astronomer Michael Brown on the radical new proposal to use satellites to bring us sunlight on demand. And Darius von Güttner Sporzyński teases out the history and humour of Netflix's new series 1670.